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"(1) The Prime Minister may notify, under Article 50(2) of the Treaty on European Union, the United Kingdom's intention to withdraw from the EU."(2) This section has effect despite any provision made by or under the European Communities Act 1972 or any other enactment."

Clause 1(1) and 2(2) of the European Union (Notification of Withdrawal) Act 2017, upon Royal Assent on 16 March 2017[4]

"Any Member State may decide to withdraw from the Union in accordance with its own constitutional requirements."

The Act's long title is To Confer power on the Prime Minister to notify, under Article 50(2) of the Treaty on European Union, the United Kingdom's intention to withdraw from the EU. The Act confers on the Prime Minister the power to give the notice required under the Treaty when a member state decides to withdraw.[5] Section 1(2) states that no provision of the European Communities Act 1972 or other enactment prevents the (notification) act taking effect.

Labour leader Jeremy Corbyn said: "I am asking all our MPs not to block Article 50 and make sure it goes through next week".[8] However, several Labour MPs were intending to rebel against the whip, including several of Corbyn's fellow opposition frontbenchers.[9][10]

The vote for the bill's second reading was carried on 1 February by 498 to 114,[11] and the bill was committed to a Committee of the Whole House, with a three-day programme for the conclusion of all proceedings up to and including third reading.[12] 47 of 229 Labour MPs voted against the bill (in defiance of the party's three-line whip), including 10 junior shadow ministers and 3 whips from the party. One Conservative (Kenneth Clarke) voted against the bill, and 2 of the 9 Liberal Democrat MPs abstained.[13]Diane Abbott, the shadow home secretary whose constituency voted to remain in the EU, was accused of having "Brexit flu" as she did not attend the vote on Article 50 due to illness, despite attending a debate in Westminster Hall three hours before the vote.[14][15]

In the parliamentary debates on the bill before enactment, members expressed concerns about the prospective effects on trade and the economy, financial services, and research and innovation policy and the rights of UK citizens in or entering the EU, and EU citizens in or entering the UK.[16]

The House of Commons agreed to hold the Committee stage on 6, 7 and 8 February, followed by the report stage and third reading on 8 February.[17] Topics covered by the amendments submitted by MPs and selected for debate at the Committee stage included: Parliamentary scrutiny, the devolved administrations (Wales, Scotland and Northern Ireland), and the status of citizens of the EU and the European Economic Area (EEA) (and also that of Swiss nationals) in the UK, and that of expatriate British citizens in other parts of the EU and the EEA outside of the UK (and also in Switzerland).[18] All amendments were withdrawn or outvoted in Committee.

At third reading, the Commons passed the bill by 494 to 122 on 8 February 2017,[19] and the bill was sent for debate in the House of Lords.

On 17 February 2017 the House of Commons Library issued a briefing paper on "Parliament's role in ratifying treaties", which quoted David Jones, Minister of State for Exiting the EU, as confirming in the debate the government's commitment to bringing forward a motion, for the approval of both Houses, that will cover the withdrawal agreement and the future relationship with the European Union, and as stating that the government expected and intended this will be before the European Parliament debates and votes on the final agreement.[20]

Before adjourning on 8 February 2017, the House of Lords gave the bill, as brought from the Commons, a first reading.[21] The House of Lords announced that Lord Bridges of Headley would move the bill's second reading for debate on 20 and 21 February, and that the Lord Privy Seal (Baroness Evans of Bowes Park) would move that Standing Orders be dispensed with so as to allow manuscript amendments to be tabled and moved for the third reading.[22]

"Within three months of exercising the power under section 1(1), Ministers of the Crown must bring forward proposals to ensure that citizens of another European Union or European Economic Area country and their family members, who are legally resident in the United Kingdom on the day on which this Act is passed, continue to be treated in the same way with regards
to their EU derived-rights and, in the case of residency, their potential to acquire such rights in the future."

In the second reading debate, one of the cross bench peers, Lord Hope, who had been a Supreme Court Justice from 2009 until his retirement in 2013, mentioned that the wording of the bill sufficed for giving notice of withdrawal, as the Supreme Court's decision in the Miller case required, but it said nothing about the process of the two further stages stated in article 50: negotiation, and the concluding of an agreement between the Union and the state that was withdrawing.[23]

At the end of the second reading debate the House agreed that the bill would be considered by a committee of the whole house.[24] This was timetabled for 27 February and 1 March 2017.[25]

On 1 March, the House of Lords, debating in Committee, made an amendment to protect EU nationals living in the UK regardless of the rights of UK nationals continuing to live in member states of the EU. The amendment was voted for by 358 with 256 against. Eight other major amendments were rejected.[26] The amendment adds to the bill a requirement that the government will introduce proposals within three months of the withdrawal notification to ensure EU citizens in the UK have the same residence rights after Brexit as before. Published statistics show many more EU nationals live in the UK (the greater numbers coming from Poland and the Republic of Ireland) than UK nationals living in other EU member states (the greater numbers in Spain and the Republic of Ireland).[27] After the Committee debate, the bill was formally reported to the House with the amendment.[28]

The House of Lords announced that the report stage would continue on 7 March, and, if concluded, the bill's third reading would be on the same day.[29]

In advance of the continuation of debate, the House of Lords published on 4 March a report discussing financial and legal complexities involved in negotiating withdrawal, including settlement of outstanding financial liabilities and division of assets.[30] The report stated that if there is no post-Brexit deal at the end of the two-year negotiating period, the UK could withdraw without payment of a "divorce bill" to the EU.[31]

At report stage on 7 March 2017, the Lords voted against the government for a second amendment (passed by 366 votes to 268), adding a new clause to the bill, headed "Parliamentary approval for the outcome of negotiations with the European Union". Lord Forsyth of Drumlean, opposing the amendment, compared it to Gulliver, in trying to tie down the Prime Minister—by hair, arms and legs—in order to prevent her from getting an agreement for the UK before leaving the European Union.[32]
The new clause was:

"(1) The Prime Minister may not conclude an agreement with the European Union under Article 50(2) of the Treaty on European Union, on the terms of the United Kingdom’s withdrawal from the European Union, without the approval of both Houses of Parliament. (2) Such approval shall be required before the European Parliament debates and votes on that agreement. (3) The prior approval of both Houses of Parliament shall also be required in relation to an agreement on the future relationship of the United Kingdom with the European Union. (4) The prior approval of both Houses of Parliament shall also be required in relation to any decision by the Prime Minister that the United Kingdom shall leave the European Union without an agreement as to the applicable terms.".[32]

At third reading, the Lords rejected a proposal presented by the Liberal Democrats for the Lords to decline "to allow the bill to pass, because the bill does not provide a mechanism for the people of the United Kingdom to have a vote, prior to the United Kingdom’s departure from the European Union, on the terms of the new relationship between the United Kingdom and the European Union”. The proposal was outvoted by 340 to 95.[33]

The Lords completed third reading on 7 March and voted to return the bill to the Commons with the two amendments.[33]

The Brexit Secretary, David Davis, stated that the government aimed to overturn the Lords amendments in the House of Commons.[34]
On 13 March the Commons voted against the first Lords amendment by 335 to 287 and against the second by 331 to 286. The bill passed both Houses of Parliament unamended.